Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cd3f498b4f594a…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 13:46:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e0e72cc5bad9fa3be126e3e21d9744af SHA-1: 4bdf537c2c37d999ce38499b2f1a495a446124f0 SHA-256: 27cd3f498b4f594a674a9195d7fd058188c9d3d58f005748a28ce2cf0bd755b9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to files related to game hacks and in-game currency. The primary URL, http://netcdn.tw/app/406889139/download-hacked-games-com-coin-master-game-hack, suggests a direct attempt to deliver a malicious payload disguised as a game hack. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/download-hacked-games-com-coin-master-game-hack
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/roblox-gift-card-free-robux_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-hack-coins_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/bleu-roblox-hack-download_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-rare-name-generator-roblox_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-free-pet-food_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-robux-free-in-roblox_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/cheats-for-roblox-unlimited-robux_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-hack-roblox_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-free-money-in-bloxburg-roblox_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/serveru-hack-roblox_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-robux-download-no-virus_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-robux-gift-card-codes_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-robux-iphone-hack_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-hack-players-on-roblox-2021_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-robux-codes-online_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031b2.bin
27d25402d997ebfe1113fd58074a799b463611bb34b263ca1045930b8b6fdb23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31B2 22920 bytes
font_01_sfnt_off000064fb.bin
d6bbba44fdf6698b8b7aa96d1af5e520d01dd7071d16206ec7b75659562237bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FB 18844 bytes

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